Mcilwain Medical Group. Geriatric Medicine, Physician Assistant (PA) • 2 Providers. 13801 Bruce B Downs Blvd, Tampa FL, 33613. Make an Appointment. (813) 345-2380. Mcilwain Medical Group is a medical group practice located in Tampa, FL that specializes in Geriatric Medicine and Physician Assistant (PA). Providers Overview Location Reviews..